固定层煤气炉的工艺调节优化

介绍了在实际工作中总结的一些有关固定层煤气炉工艺调节优化的具体实践经验。     

Neural‐hybrid control of systems with sandwiched dead‐zones

The control of systems that have sandwiched nonsmooth nonlinearities, such as a dead‐zone sandwiched between two dynamic blocks, is addressed. An adaptive inverse control scheme using a hybrid controller structure and a neural network based inverse compensator, is proposed for such systems with unknown sandwiched dead‐zone. This neural‐hybrid controller consists of an inner loop discrete‐time feedback structure incorporated with an adaptive inverse using a neural network for the unknown dead‐zone, and an outer‐loop continuous‐time feedback control law for achieving desired output tracking. The dead‐zone compensator consists of two neural networks, one used as an estimator of the sandwiched dead‐zone function and the other for the compensation itself. The compensator neural network has neurons that can approximate jump functions such as a dead‐zone inverse. The weights of the two neural networks are tuned using a modified gradient algorithm. Simulation results are given to illustrate the performance of the proposed neural‐hybrid controller. Copyright © 2002 John Wiley & Sons, Ltd.     

EPR‐Messungen in warmgehenden Anlagen

EPR measurements in heat‐working plants This paper reports about experiences of sensitization behaviour of titanium and niob stabilized steels under practice conditions at operating temperature between 340 and 600°C. Pipes, flanges, welds including heat‐affected zones are examined for sensitization with help of the e lectrochemical‐p otentiodynamic‐r eactivation‐method. Measurements were carried out on‐site during plant stoppage at different pipes with diameter between 150 to 460 mm with a set‐up measuring cell.     

安棚深层系扇三角洲低渗致密砂岩储层综合评价

泌阳凹陷安棚深层系主要指埋深大于2800m左右以核三下亚段为主的勘探目的层系，属扇三角洲沉积。砂岩储层的孔隙结构明显分为两大类，反映了以填隙物晶间孔隙为主的和以有效孔隙及裂缝为主的两种孔隙介质的孔隙结构特点。孔喉分布状况差，结构复杂，喉道微细且不均匀，致密低渗是该套储层突出特点。快速堆积，颗粒大小混杂，分选差，成分成熟度和结构成熟度低，是导致深层系砂岩低渗的主要原因；成岩作用，特别是压实作用和晚期碳酸盐胶结作用是影响储层微观非均质性和导致储层致密低渗的主要因素。综合研究可将砂岩储层划分为三类，其中Ⅰ、Ⅱ类为深层系有效油气储层，Ⅲ类储层为无效储层，但可作为有效储气层。根据孔隙度、声波时差随深度的变化关系及孔隙度、渗透率的平面展布特征，结合试验资料及微相平面展布，对深层系储层类型纵向和平面分布进行了综合评价。     

Frictional contact analysis of composite materials

In this paper, the highly non-linear frictional contact problems of composite materials are analysed. A proportional loading, the potential contact zone method and finite element analysis are used to solve the problems. A tree-like searching method is used to obtain the solution of the parametric linear complementary problem, which may overcome the anisotropic properties of contact equations caused by composite materials. In the frictional contact analysis of composite materials, the distributions of normal contact pressures, tangential contact stresses and relative tangential displacements are presented for different contact material systems and different coefficients of friction. The results show that the solutions in the paper have good agreement with Hertzian solutions. The influence of different contact material systems and different coefficients of friction on the contact stresses and displacements is large. As a numerical example, ball-indentation tests of composite materials are modelled by the three-dimensional finite element method.     

塑料导爆管反应区温度分布的近似计算

导爆管爆轰可近似地处理成气相爆轰,因而可给出其爆轰参数;文中采用高速摄影观测了两种导爆管(普通导爆管和煤矿导爆管)反应区长度,并对其进行了理论计算;在此基础上作合理近似与假设,推导出一组温度计算公式;用迭代法计算可得到导爆管反应区内的温度分布。此外,对导爆管传爆中的某些现象也作了分析。     

数字粒子图像测速中相关分析算法的改进

通过限制相关分析的搜索范围，改进相关分析的搜索路径，可减少计算工作量，并提高了分析结果的准确性和可靠性。     

综放开采顶板离层裂隙变化研究

应用理论分析等手段研究综放开采过程中采场上方覆岩离层裂隙发育变化规律，阐述采场上方离层裂隙带的范围，分析了采空区离层裂隙带的空隙渗流特性。研究结果应用于工程实践取得了良好的经济技术效果。     

随钻电磁波传播电阻率测量工具探测深度研究

在随钻电阻率测井中，基于相应的电阻率测量曲线和基于衰减的电阻率曲线在地层中经常出现彼此分离的现象，对电磁波电阻率测井的探测深度进行了详细的研究，研究表明这种分离与电阻率换算方法有关。同时指出基于IRPGF定义的探测深度有一定的局限性，只能用于定性分析，而且，IRPGF探测深度越大并不说明其测量结果越接近地层真电阻率，最后对导致电阻率曲线分离的因素进行了归纳，并指出利用随钻电阻率测量数据进行地层侵入评价是更为可靠的方法。     

焉耆盆地油田水与油气聚集保存的关系

通过对焉耆盆地油田水的基本特征及其在平面和纵向上的变化规律研究,阐述了油田水中元素与油气生成、运移、聚集和保存相关的一些特征,并依据油田水无机组份、化学系数以及总矿化度等因素,将焉耆盆地划分为四个水文地质区带。其中宝中、宝北三工河组为阻滞带,地层封闭性强,油气藏保存条件好;本布图构造带、种马场构造带、宝南区块为缓慢交替带,油气藏遭受了不同程度的破坏。